john smithson is executive producer of "into the universe" with steven hawking, as it ben buoy, both from london. in their documentary, astrophysicist steven hawkings will join us later, warns contact with extra terrestrial life may not go so well. watch. >> so if aliens ever visit us, i think the outcome would be as when christopher columbus first landed in america. which didn't turn out very well for the native-americans. >> larry: john, do you -- you're produces ting the show. do you accept the theory? >> well, we're working with one of the greatest living scient t scientists, one of the best scientific brains in the world. i'm not a scientist. my job on the discovery channel was to bring the views, imagination of the great scientist to a mass audience. these are the words of professor hawking. i am not -- don't have the scientific credentials to second guess professor hawking. i'm prepared to believe him because he is such a great scientist, and what we said about aliens in that program was very much what steven hawking wanted to say. for years he had been lecturing about the --